JP4616041B2 - Flexible hose - Google Patents

Description

  The present invention relates to a hose used for a flexible expansion joint used for a faucet fitting for a kitchen or a wash basin, a toilet, a water storage tank, a dishwasher, and other pipes for water supply and hot water supply.

  In recent years, hoses used for storage tanks for kitchens, washstands, toilets, and other water supply and hot water supply pipes have inner layer tubes mainly made of rubber or thermoplastic elastomer, and the outer periphery is made of stainless steel wire or nylon, A flexible hose reinforced by braiding such as polyester is widely used, and a hose-type flexible expansion joint is crimped and fastened to the hose.

  However, the space for piping work is relatively small, and the length to be used is short, so unnecessary external force may be applied, such as forcible bending during contact with the hose-type flexible expansion joint or contact with surrounding members. Many.

  For this reason, although the said hose type flexible expansion joint is excellent in a softness | flexibility, since the rigidity of the said braided reinforcement layer was not so high, there existed a fault that it will bend when a fixed external force is added. When the hose is bent, the water passage may be blocked, the amount of water flow may be reduced, or water passage may not be possible.

  For this reason, a method of using a stainless steel wire for a spring for the reinforcing layer was considered, but in this method, the reinforcing layer retains its shape, but the layers are not bonded. Only the inner surface layer tube may be crushed inside.

  In addition, a method of embedding a relatively dense spring in the inner surface layer tube has been considered, but in this method, the spring narrows the water passage, the product weight increases, the product cost increases, etc. There were drawbacks. If the embedded spring is rough, it may be meaningless because it is bent starting from the pitch of the spring.

  The present invention provides a hose that is resistant to bending due to external force during pipe construction without damaging the flexibility of the hose by bonding the inner layer tube and the reinforcing layer and between the reinforcing layer and the covering layer and integrating the layers. To do.

  The gist of the present invention is a flexible hose mainly used for water supply and hot water supply piping, and has an elastic inner surface layer tube, and at least one braided reinforcing layer on the outer periphery of the inner surface layer tube, A coating layer is provided on the outer periphery of the reinforcing layer, and the inner layer tube and the reinforcing layer, and the reinforcing layer and the covering layer are integrally bonded via an adhesive layer.

  More specifically, it is a flexible hose used for the above-mentioned water supply / hot water supply piping, and has an elastic inner surface whose inner layer is polybutene resin, fluororesin, cross-linked polyethylene resin, and whose outer layer is polyolefin-based thermoplastic elastomer The outer tube is selected from polyester fiber, nylon fiber, vinylon fiber, or cotton fiber having a thickness of 1,000 to 6,000 denier on the outer periphery of the inner layer tube, and the number of twists is 0 to 15 times / 10 cm. , At least one braided reinforcing layer with an ascending number of 1-5, a standing number of 12-36, and a knitting angle of 50-57 degrees, and a polyurethane-based thermoplastic elastomer or A coating layer made of a polyester-based thermoplastic elastomer is formed, and the adhesive layer between the inner surface layer tube and the reinforcing layer is a polyolefin-based elastomer. The adhesive layer between the reinforcing layer and the covering layer is a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, or a polyurethane-based adhesive, and each layer is integrated in each adhesive layer. To do.

  In particular, a flexible hose which is a combination of an inner surface tube, a reinforcing layer and a covering layer, by joining the respective boundaries together with a particularly selected adhesive layer It was possible to provide a hose that was resistant to bending due to external force and maintained the water flow diameter without impairing the flexibility of the hose itself. The improvement of was able to be secured.

  The hose of the present invention has the flexibility of the hose itself by adhering the inner layer tube and the reinforcing layer, and the reinforcing layer and the covering layer with a selected adhesive as described above, and integrating the layers. Without damaging it, it is strong against bending due to external force and can maintain the water flow diameter.

  The inner layer tube is made of rubber or a mature plastic elastomer, which is composed of a single layer or laminated layers. When the inner layer tube is composed of two layers, the inner layer is made of polybutene to improve the chlorine water resistance. A resin, a fluorine-based resin, or a crosslinked polyethylene resin is used, and a polyolefin-based mature plastic elastomer is preferably used for the outer layer.

  The reinforcing layer is preferably made of at least one layer of woven polyester, nylon, vinylon, or other synthetic fibers, or natural fibers (vegetable fibers) such as cotton.

  Such fibers are knitted at 1,000 to 6,000 denier, 0 to 15 twists / 10 cm, 1 to 5 draws, 12 to 36 standing yarns, and a knitting angle of 50 to 57 degrees. This is preferably selected according to the use conditions of the hose, for example the required pressure resistance. The knitting angle is aimed at the stationary angle (54 degrees 44 minutes) of the fiber. In addition, a certain level of yarn density is required to ensure pressure resistance, and if it is thinner than 1,000 denier, the number of driven yarns will be increased, and the production facilities will become huge, and if it is thicker than 6,000 denier, the yarn There is a risk that the overlapping portion becomes large and expensive, and there is a risk of blowing through during use.

  In order to integrate the inner surface layer tube and the reinforcing layer, the inner surface layer tube is relatively poor in adhesiveness, so that the adhesive layer is particularly limited. When a polyolefin elastomer is used, sufficient adhesion can be obtained. found.

  The coating layer is a polyurethane-based thermoplastic elastomer or a polyester-based thermoplastic elastomer, and the adhesive layer between the reinforcing layer and the coating layer is a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, or a polyurethane-based adhesive. Is used. In the case where the adhesive layer is a polyester-based thermoplastic elastomer, the coating layer and the adhesive layer can be co-extruded, and workability can be improved.

  When a polyurethane adhesive is used, the adhesive tends to permeate into the reinforcing layer. For this reason, there is a possibility that the reinforcing layer is fixed in some cases. In the case of an elastomer or a polyurethane-based thermoplastic elastomer, an adhesive effect is exhibited only by the surface layer portion of the reinforcing layer, so that the reinforcing layer is not fixed and higher flexibility can be exhibited.

  As described above, by integrating the layers constituting the hose, the hose itself is not damaged, and it is resistant to bending due to external force, and the water flow diameter can be maintained.

  As for the built-in dishwasher, a PVC-made hose has been generally used as a hot water supply hose for a built-in dishwasher, which has excellent flexibility and flexibility, and also has a resilience when bent. It was. However, some plasticizers contained in PVC contain environmental hormone substances and others emit unique odors. Also, the use of PVC is refrained from the viewpoint of reducing the burden on the environment. . However, the hose having this structure can provide a built-in dishwasher hose excellent in flexibility and flexibility without using PVC.

  For the dishwasher hot water supply, the hose of the present application is used with a hose with an inner diameter of 7-9φ, a polybutene resin is used for the inner layer of the inner tube, and a polyolefin-based thermoplastic elastomer is used for the outer layer. The inner layer tube has a wall thickness of 22 to 34% of the inner diameter of the hose, and the optimum range is 25 to 30%. If it is less than 22%, the hose is easily bent because the wall thickness is thin with respect to the inner diameter of the hose, and since the restorability after bending is poor, for example, when the main body is pushed in during the construction of a dishwasher As a result, the hose bends and the water passage is blocked or not restored. On the other hand, if it exceeds 34%, the hose becomes difficult to break because the wall thickness is thick, but this time the construction itself becomes difficult because the rigidity of the hose itself is high and hard.

(Example)
Hereinafter, it demonstrates still in detail with an Example. FIG. 1 is a cut perspective view of a hose 10 of the present invention having an inner diameter of 15 mm and an outer diameter of 24 mm. The inner surface layer tube 1 is formed of two layers. 1a is an inner layer, polybutene resin, 1b is an outer layer, and is a polyolefin-based thermoplastic elastomer (manufactured by AES: Santoprene 201-73). These are integrally formed by coextrusion. The reinforcing layer 2 is a 4,500 denier polyester fiber, and is a knitted layer having a twist number of 5/10 cm, a number of alignments of 2, and a standing number of 36. The covering layer 3 is a polyurethane-based thermoplastic elastomer (manufactured by DIC Bayer Polymer Co., Ltd .: Pandex T-8180).

  In order to integrate the inner surface tube 1 and the reinforcing layer 2, a polyolefin elastomer (manufactured by Nippon Paper Chemicals Co., Ltd .: Super Clone 822) is used as the adhesive layer 4 in the liquid state, and heat is applied. Addition penetrated both layers and integrated them.

  In order to integrate the reinforcing layer 2 and the covering layer 3, a polyester-based thermoplastic elastomer (Toray DuPont: EHytrel 4057 or 4056) is used as the adhesive layer 5. It is extruded and then penetrates into the reinforcing layer 2 and the covering layer 3 to be integrated.

  When the flexible hose of the present invention is compared with the conventional general flexible hose, the chlorine water resistance is improved with respect to the water flowing inside. Hazardous substances are no longer eluted in water. In addition, a spring is sometimes used to prevent bending, but this is made springless, which realizes light weight and cost reduction.

  Furthermore, no vinyl chloride material is used as the hose material, and it is no longer necessary to consider the generation of dioxins at the time of disposal. Further, when a polyolefin adhesive is used as the adhesive layer, it was bent due to insufficient adhesive force (so-called kink generation), but the present invention has strong adhesive force, the inner surface layer to the outer surface layer are integrated, and flexibility, Bending resistance was sufficient.

  An embodiment of a water supply hot water supply hose for a built-in dishwasher will be described. The inner diameter of the hose is 8φ, the outer diameter is 15.3φ, and the inner surface tube 1 is formed of two layers. The inner layer 1a of the inner surface layer tube is made of polybutene resin, the outer layer 1b is made of a polyolefin-based thermoplastic elastomer, the inner layer 1a has a thickness of 0.25 mm, and the outer layer 1b has a thickness of 2.00 mm. Thereby, the wall thickness of the entire inner surface layer tube is 2.25 mm, and the ratio of the wall thickness to the inner diameter of the hose as a point is 28%. The reinforcing layer 2 is a 1500 denier polyester fiber, and is a braided layer of 3 aligned and 24 standing. The covering layer 3 is a polyurethane thermoplastic elastomer.

  In the same manner as the hose described above, liquid polyolefin elastomer is used for bonding the inner layer tube and the reinforcing layer, and polyester thermoplastic elastomer is used as an adhesive layer for integrating the reinforcing layer and the covering layer. Molded by coextrusion with layers.

  When such a hose is used as a hot water supply hose for a dishwasher, PVC is not used as compared with a conventional general hot water supply hose, and the chlorine water resistance is improved for water flowing inside. By setting the inner layer tube thickness to 25-30% of the inner diameter of the hose, it was possible to prevent the hose from being bent, and even if it was bent, it could be easily restored and flexible.

  As described above, the flexible hose according to the present invention is characterized by flexibility and resistance to bending against external force because all layers constituting the hose are integrated, and in a narrow space. The workability is improved, and it can be applied to various hoses as well as water and hot water supply hoses.

  Further, the reinforcing layer 2 is a polyester fiber spun yarn having a thickness equivalent to 4500 denier (specifically, a 10S / 8 yarn twisted number of 10 times / 10 cm, an arrangement of 2 knitted fabrics, and 36 standing knitted layers) ), The impregnation of the adhesive layer 4 is further promoted, and the integration of the inner surface layer tube 1 and the reinforcing layer 2 is promoted. Similarly, the impregnation of the adhesive layer 5 is promoted, so that the integration of the reinforcing layer 2 and the covering layer 3 is also promoted. As a result, the integration of the entire hose is strengthened, and the bending resistance is improved. In addition, since the reinforcing layer 2 is an aggregate of short fibers, the slipperiness of each fiber inside the reinforcing layer is improved and the flexibility is improved.

FIG. 1 is a cut perspective view of a hose of the present invention.

Explanation of symbols

1. Internal tube,
1a ... inner layer,
1b ... outer layer,
2. Reinforcing layer,
3 ... coating layer,
4, 5 ... adhesive layer,
10 Hose.

Claims (6)

Primarily a flexible hose for use in water supply and hot water supply pipe, and an inner surface layer tubing having elasticity, and a reinforcing layer which is braided at least one layer of the outer periphery of the inner surface layer tubing, comprising a coating layer on the outer periphery of the reinforcing layer, the inner surface layer tubing and reinforcing layers, reinforcing layers and the covering layers adhered together via an adhesive layer,
The coating layer is a polyurethane-based thermoplastic elastomer or a polyester-based thermoplastic elastomer,
Adhesive layer of the reinforcing layers and the inner surface layer tubing is a polyolefin fin system elastomers,
The flexible hose that the adhesive layer of the reinforcing layer and the coating layers, characterized in that it is a polyester-based thermoplastic elastomers, or a polyurethane-based thermoplastic elastomers. It said inner surface layer tubing is a two-layer structure, the inner layer polybutene resin, fluorine resin, crosslinked polyethylene resin, a flexible hose of claim 1, wherein the outer layer is a polyolefin-based thermoplastic elastomers. Wherein the reinforcing layer is, synthetic fibers and 0-15 times / 10 cm the number 1,000 to 6,000 denier Lumpur twisted, or a natural fiber,引揃number 1-5 present, stand number 12 to 36 present the flexible hose of claim 1, wherein the braided by knitting on an angle 50-57 °. The synthetic fibers, polyester fibers, nylon fibers, flexible hose according to claim 3, wherein a vinylon fiber. Wherein the natural fibers, flexible hose according to claim 3, wherein the cotton fibers. A flexible hose mainly used for piping for water supply and hot water supply, an inner layer tube having elasticity, whose inner layer is polybutene resin, fluororesin, cross-linked polyethylene resin, and outer layer is a polyolefin-based thermoplastic elastomer, and the inner layer layer tube Is selected from polyester fiber, nylon fiber, vinylon fiber, or cotton fiber having a thickness of 1,000 to 6,000 denier, and the number of twists is 0 to 15 times / 10 cm. A braided reinforcing layer having a standing length of 12 to 36 and a knitting angle of 50 to 57 degrees, and a coating layer made of a polyurethane-based thermoplastic elastomer or a polyester-based thermoplastic elastomer on the outer periphery of the reinforcing layer And the adhesive layer between the inner surface layer tube and the reinforcing layer is a polyolefin-based elastomer, and the reinforcing layer Flexible hose adhesive layer of the coating layers, a polyester-based thermoplastic elastomer, or polyurethane-based thermoplastic elastomer, characterized in that the layers are integrated in each adhesive layer.

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